Explosion-Proof Exit Sign with LED Edge-Lighting and Battery Backup
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Solution Overview
Problem
Existing explosion-proof exit signs require periodic lamp replacement and lack an integral battery backup, compromising safety and increasing facility construction costs due to the need for external redundant power sources in hazardous locations.
Innovation Solution
An explosion-proof exit sign utilizing long-life low-powered LEDs and a sealed, rechargeable battery with a charging circuit, integrated within an explosion-proof housing capable of withstanding and preventing explosions, and featuring a manually operated test switch and health indicator for reliability and maintenance-free operation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If traditional incandescent lamps are used in explosion-proof exit signs, then the initial illumination is sufficient, but periodic lamp replacement is required which compromises safety and increases maintenance complexity
Solution Approach 1:
The patent replaces traditional incandescent lamps with light-emitting diodes (LEDs), transitioning from a thermal radiation-based illumination system to a solid-state electroluminescence system. This substitution eliminates the need for periodic lamp replacement while maintaining sufficient illumination, directly resolving the contradiction between reliability and ease of repair.
2Reliability
If external redundant power sources are required for battery backup, then power failure coverage is ensured, but facility construction costs increase
Solution Approach 1:
The patent integrates the battery backup system directly into the exit sign housing, merging the power supply function with the sign structure. This consolidation eliminates the need for separate external redundant power sources while ensuring continuous operation during power failures, resolving the contradiction between reliability and device complexity.
Solution Approach 2:
The exit sign incorporates its own integrated battery backup system that automatically activates during power failures without requiring external intervention or separate power source infrastructure. The system serves itself by containing all necessary power redundancy components within the sign assembly, reducing facility construction requirements.
3Illumination intensity
If non-LED light sources are used, then initial illumination is achieved, but periodic maintenance and lamp replacement are required
Solution Approach 1:
The patent replaces short-lived incandescent or fluorescent lamp systems with long-life LED technology, achieving both sufficient illumination intensity and extended service life. The solid-state nature of LEDs provides both the required brightness and the maintenance-free operation, simultaneously addressing both parameters of the contradiction.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution provides a reliable, maintenance-free exit sign that eliminates the need for periodic lamp replacement and external power sources, ensuring continuous illumination during power failures while maintaining explosion-proof integrity in hazardous environments.
Implementation Method 1
The light source includes a number of long life light emitting diodes mounted to align with the window and the top edge of the sign panel
Implementation Method 2
The exit sign preferably includes a sealed maintenance-fee rechargeable battery for powering the light source when externally supplied power to the exit sign is absent
Implementation Method 3
The housing is capable of preventing the ignition of gas or vapor surrounding the enclosure due to sparks, flashes or the explosion of the gas or vapor within the enclosure by providing an ample heat sink surface along any flame path to cool gases escaping from the housing
Data Source
AI summary
An exit sign for use in hazardous atmospheres including an explosion-proof housing and a sign panel with indicia thereon. The housing prevents the ignition of gas or vapor surrounding the enclosure due to sparks, flashes or an explosion of the gas or vapor within the enclosure by providing an ample heat sink surface along any flame path to cool gases escaping from the housing. The sign panel preferably includes one or more transparent sheets which are edge lit from a light source contained in the explosion-proof housing that shines through a window in the housing into the top edge of the sign panel to illuminate the face(s) and the indicia thereon. The light source utilizes a number of long life light emitting diodes. The exit sign preferably includes a sealed maintenance-fee rechargeable battery for powering the light source when externally supplied power to the exit sign is absent.